MA28139 Datasheet, PDF (31/34 Pages) Dynex Semiconductor – OBDH Bus Terminal

MA28139
OBT CONTROL PIN LIST AND DESCRIPTIONS
No.
Name
Type
121
TA0
I
122
TA1
I
123
TA2
I
124
TA3
I
125
TA4
I
126
TA5
I
127
EXTFMT
I
128
EXTMLA1
I
129
EXTMLA2
I
130
OOINH
I
40
TEST
I
87
SIMUL
I (PULL-DOWN)
41
CTpRTn
I (PULL-UP)
36
MRSTn
I (PULL-DOWN) (CSCHMITT)
112
LOSC
I (CSCHMITT)
39
TIMEOUTn O
44
TAV
I (PULL-DOWN)
Description
Terminal Address bit 0 (MSB = I-bus bit 6)
Terminal Address bit 1
Terminal Address bit 2
Terminal Address bit 3
Terminal Address bit 4
Terminal Address bit 5
Extended format Enable
Extended Memory Load Address 1 Enable
Extended Memory Load Address 2 Enable
On/Off INHibit of MOLC commands
Tie to Ground (this input for test purposes only)
Simultaneously drive both busses
CT mode when high, RT mode when low
Master reset when low
Oscillator from user to drive OBT timeout
Low when I-bus timeout
Terminal available (take low to disable responses from RTU
kernal)
OBT POWER SUPPLY DISTRIBUTION PINS
No.
Name
Type
55, 113
V_DD
P
14, 47, 80
V_SS
P
Description
Positive supply nominally +5 volts. Connect both pins.
Power and signal ground. Connect all pins.
Notes: 1. CSCHMITT means CMOS Schmitt-trigger inputs.
2. Internal pull-up or pull-down resistors should not be relied upon for proper operation and/or termination of input levels
under all operating conditions without prior consultation with GPS.
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